Alabama shad

The Alabama shad, <em>Alosa alabamae</em>, is an anadromous clupeid fish of the family Alosidae, belonging to the herring and shad lineage. Native to the Gulf Coast drainages of the southeastern United States, it undertakes seasonal migrations between estuarine and marine feeding grounds and inland freshwater rivers where adults spawn. The species is known to use estuarine habitats as transitional zones during its migratory movements between salt and freshwater environments. Adults typically reach a maximum recorded length of approximately 51 cm, making this one of the larger species in the genus <em>Alosa</em> in North America. Like other shads, <em>Alosa alabamae</em> is a filter-feeding planktivore in its marine and estuarine phase, consuming zooplankton and small fish. Historically, the Alabama shad ascended Gulf Coast rivers including the Mobile, Apalachicola, and Mississippi river systems in substantial numbers each spring to spawn, with adults dying shortly after reproduction in some populations. Populations have declined significantly due to the construction of dams that block migratory passage, along with habitat alteration and overharvest during the twentieth century. Recovery efforts have included the installation of fish passage structures at some dam sites. <em>Alosa alabamae</em> is currently assessed as a species of conservation concern, though its formal IUCN status requires confirmation.